Zebrafish 2021 Apr 12. Epub 2021 Apr 12.
Institute for Natural and Life Sciences, Federal University of Latin American Integration, Foz do Iguaçu, Brazil.
The chromosomes of the dogtooth characins, fish species of the family Cynodontidae, have only a relatively small amount of heterochromatin, including the terminal portion. Curiously, in the cynodontid , the terminal portion is rich in repetitive DNAs, including transposable retroelements and microsatellite sequences. Given this, this study investigated the composition of the terminal portion of the chromosomes of two cynodontid species ( and ), to compile a database for the evaluation of all three cynodontid genera, and in particular, verify the possible tendency for the accumulation of repetitive DNAs in the terminal portion of the chromosomes of , , and The 1, 3, and 6 transposable retroelements and the (CA) (GA), (GATA), (GACA), (CAT), and (CAC) microsatellite motifs are found primarily in the terminal portion of the chromosomes of the species analyzed in this study, except , which has no evidence of the presence of or through the fluorescent hybridization technique. Read More